Failure Code [Dy20Ka] Wiper Motor Open Circuit - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)

Failure code [DY20KA] Wiper Motor Open Circuit

Action level Failure code
DY20KA
When windshield wiper works, W signal that indicates that wiper motor reaches working
Detail of
area upper end position is not input.
failure
Stops working output to wiper motor.
Action of
If cause of failure disappears, machine becomes normal by itself.
controller
Problem on
Wiper motor does not work.
machine
Signal input (ON/OFF) of W contact signal that indicates wiper working area end can be
checked by using monitoring function.
(Code: 02204)
Related
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot
information
be measured at pump controller connector.
Method of reproducing failure code: Turn starting switch to ON position and set wiper switch
to INT or ON position.
No. Cause
Defective wiper
motor
1
(Internal open circuit)
Open or short circuit
2
in wiring harness
Open circuit in wiring
harness
3
(Wire breakage or
defective contact of
connector)
Pump controller is
4
defective.
40-368
Wiper Motor Open Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector M05 and connect T-adapter to female side.
Between M05 (female) (6) and (5)
Resis-
tance
Between M05 (female) (1) and (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors CP01 and CP02, and connect T-adapters to each
female side.
Between CP01 (female) (56) and
ground
Resis-
tance
Between CP02 (female) (114) and
(119)
a If no failure is found by check on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors CP01, CP02, and M05.
3. Connect T-adapters to female side of connectors CP01 and CP02 and male
side of M05.
Between CP01 (female) (56) and M05 (male) (6)
Between M05 (male) (5) and ground (T01)
Resis-
tance
Between CP02 (female) (114) and M05 (male) (1)
Between CP02 (female) (119) and M05 (male) (3)
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
(PC88MR-DY20KA-400-A-Z0-A)
Wiper position:
Working area upper
end
Wiper position: Other
than working area
Min. 1 Mz
upper end
Wiper position: Whole
Max. 20 z
range
Wiper position:
Working area upper
end
Wiper position: Other
than working area
Min. 1 Mz
upper end
Wiper position: Whole
Max. 20 z
range
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
PC88MR-10